Improvement in boiler-furnaces



S. H. BEVINS. Boiler Furnace.

No. 202,981. Patented April 30,1878.

N,PEYERS. PHUTUUTHOGRAPHER, WASHINGTON. D C

UNITED STATES PATENT OFFICE.

SETE H. BEVIN S, OF NEW YORK, N. Y.

IMPROVEMENT IN lsolLER-FURNAcvl-:s

Specification forming part of Letters Patent No. 202,981, dated April 30, 1878; application filed February 1, 1878.

To all whom 'it may concern:

Be it known that I, Sn'rn H. BEvrNs, of the city and State of New York, have invented an Improvement in Boiler-Furnaces, of which the following is a specilication:

Air has been introduced at or near the .bridge-wall of a furnace, to combine with unconsumed gases and promote combustion, and the products of combustion have often been carried through a descending iiue before they rise into the chimney. In most chimneyflues there is a damper, and when this is closed, or nearly so, there is an accumulation of unconsumed gases-such as carbonio oxidethat is dangerous, as it often explodes when coming in contact with the atmosphere.

My improvement is made for insuring a more perfect combustion of the gases, and for preventing the accumulation of the gases under any of the ordinary conditions of use.

In the drawing, Figure 1 is a cross-section of the boiler at the rear end of the bridge-wall, and Fig. 2 is a longitudinal section through the lues of the boiler and mason-work.

The boiler a is of usual character. I have shown a round or tubular boiler, with the fire-chamber b, grate-bars c, and bridge-wall e near one end, and a iiue, f, below the boiler, and a return iiue or tubes, g, to the descending iue h, which may be at or near one end or side of the boiler, and in which is the damper k, to close or partially close the said descending flue h, and lis the iiue leading to a chimney in any convenient position. Theparts thus far described do not contain any novel feature of construction.

It often happens that the damper is entirely closed in checking the flue. To prevent the accumulation of unconsumed gases and the danger arising from explosion, I make use of the auxiliary flue-tube m, connecting from one part of the iiue h to the same iiue at the other side of the damper, thereby maintaining a constant circulation of the gases to the chimney, whether the damper is open or closed.

At the rear part of the bridge-wall I place a transverse flue, o, or air-pipe, with a regulating inlet-damper, and I employ tubular or jet nozzles r, rising from the said air-pipe o to the height, or near the height, of the bridgewall, whereby atmospheric air will be admitted directly into the unconsumed gases as they pass away from the fire, and thereby the necessary oxygen is added to consume the carbonic oxide and intensify the heat.

The opening in the flue or tube m should be such as to provide for the escape of nearly the same amount of gases as air that passes through the iiue o and tubular jet-pipes r.

I am aware that descending iiues with dampers have been connected to boilers and heaters, but the risk remains, as aforesaid, of the dampers being improperly placed. My auxiliary flue has no dampers, and hence is unobstructed.

Boxes and tubes have also been introduced to supply air at the bridge-wall; but the same are liable to injury by the heat. I n my improvement the air-pipe is at a distance below the bridge-wall, and is protected, and only the upper ends of the air nozzles are exposed, and these can easily be. replaced. Besides this, the descending and the auxiliary flues act, in conjunction with the air-tubes at the bridgewall, to consume the gases passing from the re when the air is shut off from the ash-pit and the chimneydiue closed. The gases then pass by the auxiliary flue, and the air-supply at the bridge-wall consumes the carbonio-oxide gases, and thus prevents any dangerous accumulation.

I claim as my invention- The combination, with a boiler-furnace and bridge-wall, of the air-inlet pipes at the back of the bridge-wall, with openings near the top thereof, and the descending iiue h, with a damper, and the unobstructed auxiliary flue, connecting with the iiue h above and below the damper k, substantially as set forth.

Signed by me this 29th day of January, A.

SETH H. BEVINS. Witnesses:

Gno. T. PINCKNEY, Oms. H. SMITH. 

